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TABLE OF CONTENTS 



PAGE 



PREFACE . . . . . . . . . . . . . . . . . . iv 



LIST OF PLATES . . . . . . . . . . . . . . . . vi 



LIST OF FIGURES IN THE TEXT . . . . . . . . . . vii 



INTRODUCTION 



Importance of the Study of Tsetse-flies . . . . . . . . 1 



Chapter I. GENERAL CHARACTERS OF TSETSE-FLIES GEO- 



GRAPHICAL DISTRIBUTION OF TSETSE-FLIES IN 

 GENERAL CLASSIFICATION OF TSETSE-FLIES . . 4 



,, II. DISTINCTIVE CHARACTERS AND GEOGRAPHICAL 

 DISTRIBUTION OF THE VARIOUS SPECIES OF 

 TSETSE-FLIES 8 



III. REPRODUCTION OF TSETSE-FLIES. 



Copulation Gestation Birth or Extrusion 

 of the Larva Duration of the Period of 

 Gestation Larva Pupation Pupa 

 Emergence of the Perfect Insect or Imago 

 Parthenogenesis Duration of the Pupal 

 Stage 23 



IV. BREEDING PLACES BREEDING SEASON . . . . 34 



,, V. " FLY-BELTS " OR AREAS IN WHICH THE 



DIFFERENT SPECIES OF TSETSE ARE FOUND . . 44 



VI. DISTRIBUTION OF TSETSE-FLIES IN BELGIAN 



CONGO 60 



,, VII. POINTS IN BIONOMICS. 



Seasonal Migrations Range of Flight 

 Travelling Habits Resting Surfaces Pro- 

 portion of the Sexes 64 



,, VIII. TSETSE-FLIES AND THEIR FOOD. 



Times when Tsetse-flies are most active : the 

 Search for Food Experiments in the Taking 

 of Food by Tsetse-flies Feeding and Diges- 

 tion Study of the Natural Food of Tsetse- 

 flies by Examination of the Contents of the 

 Alimentary Canal The Drinking of Water 

 by Tsetse-flies Experiments in Feeding 

 Tsetse-flies with Extravasated Blood . . 78 



IX. RELATION OF TSETSE-FLIES TO THE SMALLER 



ANIMALS . . . . . . . . . . . . 90 



X. TSETSE-FLIES AND BIG GAME .. .. .. 94 



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